function clickButton(e, buttonid){ 
	var bt = document.getElementById(buttonid); 
	if (typeof bt == 'object'){ 
		if(navigator.appName.indexOf("Netscape")>(-1)){ 
				if (e.keyCode == 13){ 
					bt.click(); 
					return false; 
				} 
		} 
		if (navigator.appName.indexOf("Microsoft Internet Explorer")>(-1)){ 
				if (event.keyCode == 13){ 
					bt.click(); 
					return false; 
				} 
		} 
	} 
}